Trump used the brash expletive while venting to his former chief strategist Steve Bannon.

An enraged President Trump called acting attorney general Sally Yates "a c--t" after she refused to uphold his contentious travel ban targeting Muslims, according to a new book about the Trump administration.

Trump used the harsh expletive while venting to his former chief strategist Steve Bannon, according to a copy of Michael Wolff's new book obtained by the Daily News.

Sally Yates served as acting attorney general for a mere 10 days.

(Pete Marovich/Getty Images)

"To Trump, he was just up against Sally Yates, who was, he steamed, 'such a c--t,'" the book reads.

Yates, who served as acting attorney general for a mere 10 days, drew the President's ire after she refused to enforce his initial travel ban, which proposed to bar citizens of seven Muslim-majority countries from entering the U.S.